diff --git a/button_contact.c b/button_contact.c
index 9468796bc0e71a8cfe4b1437620123b7e5c51c95..328eefe03bca2d1043664804adfcd5ce741169f7 100644
--- a/button_contact.c
+++ b/button_contact.c
@@ -7,13 +7,12 @@ int main(void) {
     // Configure led_pin as an output.
     DDRB |= led_pin;
 
-    // Configure button_pin as an output.
+    // Configure button_pin as an input.
     DDRA &= ~button_pin;
 
     // Activate button_pin's pullup resistor.
     PORTA |= button_pin;
 
-    // Nothing left to do, so just spin.
     while (1) {
         // Turn on the LED when the button is pressed.
         if (PINA & button_pin) {
diff --git a/button_toggle.c b/button_toggle.c
index dd98d79052aaeb70b1cdc8dcf12abbdf3ddb98ee..e13dddd5ed7fd57538ef0a3cf4a4cb01d40213b9 100644
--- a/button_toggle.c
+++ b/button_toggle.c
@@ -23,7 +23,6 @@ int main(void) {
     int bouncy_switch_state = 0;
     int debounced_switch_state = 0;
 
-    // Nothing left to do, so just spin.
     while (1) {
         // Use the timer to count how long it's been since button_pin changed state.
         if ((PINA & button_pin) != bouncy_switch_state) {